竖井地质编录有哪些常用的方法？
参考答案：
井筒展开图式编录，井筒柱状剖面图式编录，石门地质编录。
解方程：
①x2-2x=15
②x2-3x+1=0．
③（x-1）2-5（x-1）+6=0．
This book is said to be special which ____ many events not found in other history books. [ ]
A. writes
B. covers
C. prints
D. reads
